title: Bis(o-phenylenebis(acetylacetonato))dicopper(II): a strained copper(II) dimer exhibiting a wide range of colors in the solid state.
abstract: The bis(β-diketone) o-pbaH(2) (o-phenylenebis(acetylacetone), 1) reacts readily with Cu(2+). Although this reaction was expected to yield a trimeric product (2) on geometric grounds, the binuclear complex Cu(2)(o-pba)(2) (3) is obtained instead. Materials containing Cu(2)(o-pba)(2) adopt a variety of colors, depending on the solvents used in preparation: dark green (microcrystalline, 3a), golden-brown (ansolvous, 3b), green-brown (CHCl(3)-C(6)H(6) solvate, 4), dark blue (nitrobenzene solvate, 5), or violet (toluene solvate, 6). Complexes 5 and 6 contain 1D chains of Cu(2)(o-pba)(2) molecules joined by weak Cu···O interactions. Crystalline adducts [Cu(2)(o-pba)(2)L](n) (7 and 8) containing 1D polymeric chains are also obtained upon reaction of 3 with bridging ligands (L = 1,2-bis(4-pyridyl)ethane or 4,4'-bipyridine, respectively). All of the new metal complexes except for 3a have been characterized by X-ray analysis.
authors.affiliation: Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA. cpariya@cas.org
authors.forename: Chandi
authors.initials: C
authors.lastname: Pariya
authors.forename: Frank R
authors.initials: FR
authors.lastname: Fronczek
authors.forename: Andrew W
authors.initials: AW
authors.lastname: Maverick
mesh_terms: D003116:Color; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D019281:Dimerization; D008958:Models, Molecular
chemical_list: D056831:Coordination Complexes; D003300:Copper